Furnace.



No. 893,196. PATEN'IED JULY 14, 1908. G. 0. RICHARDS & M. S. MILLER.

PURNAGE.

APPLIOATION FILED JAN. 14, 190s.

GEORGE RICHARDS AND MARTIN S. MILLER, OF CLEVELAND, OHIO.

. FURN ACE g Specification of Letters Patent.

Patented July 14, 1908.

Application :filed January 14, 1908. Serial No. 410,815.

To all whom t ma/y concern:

Be it known that we, GEORGE O. RICH- ARDs and MARTIN S. MILLER, citizensof the United States, residing at Cleveland, in the county of Cuyahogaand State of Ohio, have invented certain new and useful Improvements inFurnaces, of which the following is a specification.

This invention relates to -hot air furnaces, and has for its object toprovide -improved means for heating the air which is supplied by thefurnace, said means embodying a cylinder or air chamber located in thejacket above the fire pot and connected to the surrounding space in thejacket by means of'a large number of short horizontal llues or pipesaround which the products of combustion circulate before they pass tothe smoke Improved means are also provided for controlling the amount ofair caused through said chamber.

The invention is illustrated in the accompanying drawings, in whichFigure 1 is a side elevation, part of the outer jacket being brokenaway. Fig. 2 is a vertical section. Fig. 3 is a horizontal section onthe line 3-3s of Fig. 1.

Referring specifically to the drawings, 1 indicates'the outer jacketconveniently formed of sheet metal or the like and standing upon a base15. an air inlet 9. This jacket has a top 23, and service pipes 13 bywhich the hot air is delivered as desired.

The fire pot is door 6, an ash pit, operating rod 27.

Above the fire pot is a cylinder or drum 3 and within this, and spacedtherefrom, is another cylinder or drum 14. These cylinders are connectedby a considerable number of short horizontal pipes 4 which extend acrossthe space between the drums, and allow the passage of air from the space19, within the jacket, to the drum 14. Said drum 14 is closed at thebottom and is located directly above the center of the fire pot, inposition to receive the greatest heat thereof. The space between thedrums 3 and 14 is closed at the top, as indicated by 20, eXceptfor theflue pipe 17 leading to a chimney. The space between the drum 3 and thejacket 1 is also indicated at 5, with a fuel as at 8, and a grate 16with to pass' It is provided at the bottom with closed or provided atthe to with an annular plate 12 whichis providedp with a series ofopenings 21 and mounted upon top of this p ate is another movableannular plate 11 which is provided with similar openings and which maybe turned by means of a handle 10 projecting throughl a slot 2 in theside of the jacket. By turnin the valve plate 11 the o enings arecontrol ed. When they are close all the heated air necessarily passesfrom the space 19 through the pipes 4 and the central chamber 14.. Thisheats the air to the highest degree possible. When more moderatetemperature is desired thev plate may be turned to open the valve moreor less, and part of the air at least will flow directly through theopenings 21 to the top of the jacket and thence to the service pipes.

he arrangement shown causes the heated air, when conducted throu h thecentral heating chamber, to absorb eat to a hi h degree, from theadjacent tubes and the wa s ofthe chamber, which, as stated, are eX-posed to the products of combustion flowing thereover. The drums and theconnecting pipes are preferably constructed of sheet metal and can beset in place upon the fire p Although illustrated in connection with acoal burner, the a paratus can without invention be modified) to receiveits heat from a gas burner placed within the fire pot. e claim:

In a furnace, the combination of a fire pot and an outer jacket, innerand outer spaced drums located above the lire pot and within the jacketand below the top thereof, forming a hot air chamber in the upper partof the jacket, with an air space between the outer drum and the sides ofthe jacket, the inner drum openin at the top into the said chamber, anda pIurality of horizontal pipes eX- tending across the s ace between thedrums and connecting the cliamber within the inner drumwith the said airspace between the outer drum and the jacket.

In testimony whereof we affix our signatures, in presence of twowitnesses.

GEORGE O. RICHARDS. MARTIN S. MILLER. Witnesses:

JOHN A. BOMMHARDT, MONROE E. MILLER.

